If the altenator is new, then it is very possible that the bad altenator may have fried the battery.
I would have y our battery tested. If you have a voltmeter, you can test altenator and battery. Part stores usually do it free.

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The alternator needs power from the ignition switch for the stator coil. The ground for the stator comes from the power module. Then, the charge wire from the alternator to the battery has a fusible link that you should check. Use an ohmmeter to check the continuity of the fusible link and, with the key on, back-probe the dark green wires to the alternator to see if one of them is getting 12 volts from the ignition switch. The other dark green wire should have continuity to engine ground. If all of these things are true and the alternator is good, you should get at least 14 volts out of the alternator to the battery with the engine running. Let me know if you have any questions.

i had this or similar sounding issue with my robin trike, after lots of messing about it was found to be a loose alternator not generating enough charge to keep the battery topped up. I imagine the drive round the block used quite a bit of your battery (30 amps approx just to start it) thats when i got my stalling and sluggish responce, not enough power to fireup the plugs 100% run a volt meter on the alternator and the battery